GASCO 116ES-175-1.8 Sulfur Dioxide SO2 1.8 PPM Calibration Gas Balance Nitrogen in a 116es Liter ecosmart Factory Refillable Cylinder, For Use with Any and All Gas Detectors, Cylinder Connection C-10, Calibration Certificate NIST, Made in the USA

Blend Tolerance: +/- 10%, Analytical Tolerance: +/- 2%

Reactive Gas use a Stainless Steel Regulator